CN106116138A - A kind of wire drawing coating processes of minor diameter low-loss bend-insensitive single-mode optical fiber - Google Patents
A kind of wire drawing coating processes of minor diameter low-loss bend-insensitive single-mode optical fiber Download PDFInfo
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- CN106116138A CN106116138A CN201610328402.3A CN201610328402A CN106116138A CN 106116138 A CN106116138 A CN 106116138A CN 201610328402 A CN201610328402 A CN 201610328402A CN 106116138 A CN106116138 A CN 106116138A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/0253—Controlling or regulating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/105—Organic claddings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
- C03C25/16—Dipping
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- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
The present invention relates to the wire drawing coating processes of a kind of minor diameter low-loss bend-insensitive single-mode optical fiber, the wire drawing coating processes step of this minor diameter bend-insensitive single-mode optical fiber is as follows: melt drawing, anneals, calibrate, coat and screens.It is an advantage of the current invention that: glass preform notices that in drawing process tension force controls, and improves the bending loss of optical fiber；PLC is used to control, the external diameter size of actual measurement glass optical fiber, by measurement feedback to PLC control unit, dynamically control by adjusting prefabricated rods charging rate and drawing speed, it is achieved automatically controlling of the course of processing；Use the coating die polyacrylic acid coating resin on optical fiber improved, not only reduce the coat thickness of optical fiber, and protect internal optical fiber, and the least to the performance impact of optical fiber；Owing to coating is thinning, adjust solidification power at solidified cell, energy-saving and cost-reducing, it is thus achieved that optimum solidification power match, reduce the accessory loss that optical fiber curing process produces.
Description
Technical field
The present invention relates to a kind of optical fiber fabrication arts, particularly to a kind of minor diameter low-loss bend-insensitive single-mode optical fiber
Wire drawing coating processes.
Background technology
In China " 12 " planning, generation information communication is included seven big emerging strategic industries in, it is desirable to accelerate general
The information network infrastructure construction merged in, broadband, accelerate to advance the integration of three networks, the intellectuality of accelerating important infrastructure changes
Make, promote next-generation mobile communications and Next Generation Internet equipment, promote Internet of Things, the research and development of cloud computing and Demonstration Application.Light
The application focus of fine optical cable is broadband China and intelligent grid construction.
Metropolitan area network communications construction promotes laying on a large scale of optical cable.For operator, city is laid Communication ray
Underground piping and the conduit route resource of cable are the most rare.Newly-built route can cause removal, fund, time schedule, city close
Collection zone duct resource cannot be expanded and other infrastructure rob the situation of route.If rare route resource can be made full use of
Lay more substantial optical fiber, beyond doubt the promotion to urban construction.This size-constrained in the environment of, use smaller size of
Single-mode fiber, in limited space resources, can introduce the optical cable of more Multi-core number, to save space, conduit resource.By single mode
Fibre coating diameter electricity routine drops to undersized research and meets this kind of Novel optical cable application model exactly.
Along with the technology development such as country " broadband China ", " the Internet+", city is laid the underground of communications optical cable
Pipeline and conduit route resource are the most rare, and this just proposes new requirement to current optical fiber, optical cable.Single-mode fiber coating is straight
Footpath is dropped to undersized demand by routine and arises at the historic moment, and i.e. on the premise of ensureing current performance, reduces cable size.And optical fiber
As the core material of optical cable, reducing of its size, especially Multi-core number optical cable, such as 96 cores, 128 cores, 256 cores etc., Ke Yiyou
Effect reduces cable size；Owing to coating is thinning, optical fiber property is brought and has a strong impact on, accordingly, it would be desirable to by prefabricated rods is reflected
The adjustment of rate cross-section structure, wire-drawing equipment and drawing process condition are improved, it is possible to produce the small size optical fiber that coating diameter is stable.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and reduces cable configuration size significantly, and properties of optical fiber cable will not
The wire drawing coating processes of the minor diameter bend-insensitive single-mode optical fiber declined occurs.
For solving above-mentioned technical problem, the technical scheme is that a kind of minor diameter low-loss bend-insensitive single mode
The wire drawing coating processes of optical fiber, its innovative point is: the wire drawing coating work of this minor diameter low-loss bend-insensitive single-mode optical fiber
Skill step is as follows:
(1) melt drawing: prefabricated rods early stage processed puts into heating furnace, prefabricated rods is melted, drawing tensile force be 100 ~
Taken out with certain speed under the effect of 190g and be fine into as glass optical fiber；
(2) annealing: optical fiber after pull filamentation enters cycle of annealing, cycle of annealing include successively annealing high temperature furnace, heating furnace with
And three parts of insulating tube, by three grades of annealing operations, optical fiber has slowly cooled to surface and has supposed temperature, has effectively eliminated light
Fine residualinternal stress, and reduce the decay of optical fiber；
(3) calibrate: the external diameter of glass optical fiber by fibre measure through measuring instrument, measurement feedback to PLC control unit,
Prefabricated rods charging rate and drawing speed are adjusted by PLC control unit according to fibre diameter data, play drawing optical fibers mistake
The integral control action of journey；
(4) coating: optical fiber enters coating operation, and coating die is the column structure of a hollow, fills acrylic acid in hollow cavity
Cold coating, in the motor process of optical fiber, the coating in hollow cavity covers uniformly on fiber outer surface, is formed certain
The coat of thickness, coat includes the dimension scale of low modulus undercoating and high-modulus external coating, undercoating and external coating
It is 0.8 ~ 1.2:1；
(5) solidification: optical fiber enters cure lamp range of exposures, according to the situation of coat lower thickness, cure lamp solidification power is adjusted
Whole is 1800 ~ 3000W；
(6) screening: due to the reduction of fiber size, adjusts the guide wheel speed of screening rewinding machine, for traction optical fiber provide 0.35 ~
The take-up pulling force of 0.85g.
Further, in described step (1), heating in-furnace temperature controls at 1800 DEG C ~ 2200 DEG C.
Further, in described step (2) furnace temp at 900 DEG C ~ 1200 DEG C.
Further, in described step (2), heating furnace is positioned at below annealing high temperature furnace at 15cm, and insulating tube is positioned at heating
Below stove at 20 ~ 25cm.
Further, in described step (4), inside coating die, include coniform inner chamber and the company of up big and down small setting
Being connected on the coating hole of coniform inner chamber lower end, the tapering of coniform inner chamber is 3 ~ 25 °, and coating hole length is 0.8 ~ 5mm.
It is an advantage of the current invention that:
(1) glass preform notices that in drawing process tension force controls, and improves the bending loss of optical fiber；PLC is used to control, actual measurement
The external diameter size of glass optical fiber, by measurement feedback to PLC control unit, by adjusting prefabricated rods charging rate and wire drawing speed
Degree dynamically controls, it is achieved automatically controlling of the course of processing；Use the coating die polyacrylic acid coating on optical fiber improved
Resin, and use proof optimal painting stratum proportion, not only reduce the coat thickness of optical fiber, and protect interior lights
Fibre, and the least to the performance impact of optical fiber；Owing to coating is thinning, adjust solidification power at solidified cell, energy-saving and cost-reducing, it is thus achieved that
Excellent solidification power match, reduces the accessory loss that optical fiber curing process produces.
(2) use the coating die improved, have adjusted tapering and the length of mould, it is thus achieved that be suitable for small size optical fiber pressure
Power gradient scope, it is ensured that coating quality and concentricity requirement.
Accompanying drawing explanation
Fig. 1 is that the minor diameter of the wire drawing coating processes of the present invention a kind of minor diameter low-loss bend-insensitive single-mode optical fiber is curved
Bent insensitive single-mode fiber sectional view.
Fig. 2 is the flow chart of the wire drawing coating processes of the present invention a kind of minor diameter low-loss bend-insensitive single-mode optical fiber.
Fig. 3 is the coating die of the wire drawing coating processes of the present invention a kind of minor diameter low-loss bend-insensitive single-mode optical fiber
Schematic diagram.
Detailed description of the invention
As it is shown in figure 1, the nominal diameter of minor diameter bend-insensitive single-mode optical fiber is 200mm, the most successively
Including fibre core 1, covering and coat, fibre core 1 layer is germanium-doped silica glassy layer, and covering includes inner cladding 2 and outsourcing
Layer 3, inner cladding 2 be the sagging inner cladding mixing F, in prefabricated rods prepare this optical fiber minimizing germanium volume with reduction sandwich layer in auspicious
Profit scattering, covering uses deep fluorine doped to make the inner cladding 2 of refractive index profile be formed to sink simultaneously, and controls radial refractive index and uniformly divide
Cloth and refractive index profile slope.
As in figure 2 it is shown, the wire drawing coating processes step of this minor diameter bend-insensitive single-mode optical fiber is as follows:
(1) melt drawing: prefabricated rods early stage processed puts into heating furnace, prefabricated rods is melted, drawing tensile force be 100 ~
Taken out with certain speed under the effect of 190g and be fine into as glass optical fiber；
(2) annealing: optical fiber after pull filamentation enters cycle of annealing, cycle of annealing include successively annealing high temperature furnace, heating furnace with
And three parts of insulating tube, by three grades of annealing operations, optical fiber has slowly cooled to surface and has supposed temperature, has effectively eliminated light
Fine residualinternal stress, and reduce the decay of optical fiber；
(3) calibrate: the external diameter of glass optical fiber by fibre measure through measuring instrument, measurement feedback to PLC control unit,
Prefabricated rods charging rate and drawing speed are adjusted by PLC control unit according to fibre diameter data, play drawing optical fibers mistake
The integral control action of journey；
(4) coating: optical fiber enters coating operation, as it is shown on figure 3, the column structure that coating die 6 is a hollow, coating die 6
Inside includes the coniform inner chamber 7 of up big and down small setting and is connected to the coating hole 9 of coniform inner chamber 7 lower end, coniform interior
The tapering in chamber 7 is 3 ~ 25 °, coats a length of 0.8 ~ 5mm in hole 9；Filling acrylic resin paint in coniform cavity 7, optical fiber depends on
The secondary coniform inner chamber through coating die 7 and coating hole 9, the painting in the motor process of optical fiber, in cone shape inner chamber 7
Material covers uniformly on optical fiber 8 outer surface, by the coating hole 9 of lower end, forms certain thickness coat, and coat includes
Low modulus undercoating and high-modulus external coating, undercoating is 0.8 ~ 1.2:1 with the dimension scale of external coating；
(5) solidification: optical fiber enters cure lamp range of exposures, according to the situation of coat lower thickness, cure lamp solidification power is adjusted
Whole is 1800 ~ 3000W；
(6) screening: due to the reduction of fiber size, adjusts the guide wheel speed of screening rewinding machine, for traction optical fiber provide 0.35 ~
The take-up pulling force of 0.85g.
In drawing process, note the control of drawing tensile force.Fibre loss and bending loss are all by the shadow of drawing tensile force
Ringing, drawing tensile force increases the loss by increasing optical fiber, but can improve bending loss simultaneously, therefore, in drawing process, needs
Grope suitable drawing tensile force, such that it is able to the balance solving fibre loss and bending loss controls, through experimental verification, when opening
When power is in the range of 100 ~ 190g, fibre loss and the bending loss of this product can reach optimal value.
Bending loss of optical fiber can be represented by dimensionless group:
MAC=MFD/λ
Wherein, MFD is the mode field diameter of optical fiber, and λ is the cutoff wavelength of optical fiber.From the point of view of result of study, MAC is the least, optical fiber
Bending loss is the least.In drawing process, by effective control of MAC value, it is ensured that the macrobending loss of optical fiber is not with coating diameter
Substantially reduce.
In annealing process, optical fiber is through three annealing, and for the first time in fiber drawing furnace annealing high temperature furnace, optical fiber is at annealing height
Slowly lowering the temperature in temperature stove, drop to 1500 degree, second time annealing is annealed in heating furnace 15cm at below high-temperature annealing furnace, guarantor
Card optical fiber temperature in heating furnace is at 1000 ~ 1200 degree, and third time is annealed insulating tube at 20 ~ 50cm below heating furnace
In, optical fiber is carried out insulation annealing, by above-mentioned three annealing so that the temperature of optical fiber changes in gradient, when optical fiber is exposed to
Time in the cold air environment of workshop, suppose temperature already below surface, serve good annealing effect.
Considering the matching of inside and outside coating thickness in coating procedure, high-modulus external coating bears optical fiber radially and laterally
Pressure, low modulus undercoating absorbs and puts on the external force on optical fiber, plays cushioning effect.The performance of coated with resins itself, as viscosity,
Modulus, glass transition temperature etc. affect bending loss of optical fiber.Therefore, this 200 μm small size optical fiber selects different performance to be coated with
The thickness covering resin and research inside and outside coating is more crucial.Combining with theoretical analysis, by the different coating of design, undercoating thickness
Degree, the DOE design of experiment analysis of external coating thickness three factor, choose two-layer acrylic resin coating, and inside and outside two layers of coatings
Thickness ratio is the proportionate relationship of 0.8 ~ 1.2:1, it is possible to ensures that the thickness of inside and outside coating enough plays protection optical fiber effect, stablizes light
Fine performance.
In the curing process, owing to coating is thinning, coat curing rate is compared stock size optical fiber and is significantly increased, former
There is curing process the most inapplicable.From energy-saving and cost-reducing consideration, it is adjusted to 1800 ~ 3000W by adjusting solidification power, outside reaching to meet
Sight, curing degree and related mechanical properties requirement, it is thus achieved that optimum solidification power match, reduce the additional of optical fiber curing process generation
Loss.
In screening process, optical fiber is applied certain pulling force by screening machine and is wound, during suffered tension force can cause
The added losses of optical fiber, when tension force is bigger, optical fiber ruptures.Simultaneously as the reduction of fiber size, screening technology originally
So that requirement can not be met, winding displacement pitch is adjusted to 0.38 ~ 0.44mm.Winding displacement pitch is the best easily causes bending loss of optical fiber, twines
The best around density.Regulation screening machine takeup tension is 0.35 ~ 0.85g, and control line speed keeps tension stability and winding displacement pitch
Adjustment, reduce additional attenuation, reduce bending loss.
By the manufacture of 200 μm low-loss bend-insensitive single-mode optical fibers, breach optical fiber coating die design, little
Key technology and the manufacturing process such as size fibers curing process, microbend performance improvement, filled up domestic blank.
Ultimate principle and the principal character of the present invention have more than been shown and described.Skilled person will appreciate that of the industry,
The present invention is not restricted to the described embodiments, the principle that the present invention is simply described described in above-described embodiment and description,
Without departing from the spirit and scope, the present invention also has various changes and modifications, and these changes and improvements all fall
Enter in scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (5)
1. a wire drawing coating processes for minor diameter low-loss bend-insensitive single-mode optical fiber, described minor diameter bend-insensitive list
The nominal diameter of mode fiber is 200mm, includes that fibre core, covering and coat, described core layer are the most successively
Germanium-doped silica glassy layer, described covering includes the sagging inner cladding that inner cladding and surrounding layer, described inner cladding are fluorine doped,
It is characterized in that: the wire drawing coating processes step of this minor diameter low-loss bend-insensitive single-mode optical fiber is as follows:
Melt drawing: prefabricated rods early stage processed puts into heating furnace, prefabricated rods is melted, and is 100 ~ 190g at drawing tensile force
Effect under taken out with certain speed and to be fine into as glass optical fiber；
Annealing: the optical fiber after pull filamentation enters cycle of annealing, cycle of annealing includes anneal high temperature furnace, heating furnace and guarantor successively
Wen Guansan part, by three grades of annealing operations, optical fiber has slowly cooled to surface and has supposed temperature, has effectively eliminated optical fiber residual
Remaining internal stress, and reduce the decay of optical fiber；
Calibrating: the external diameter of glass optical fiber is measured through measuring instrument by fibre, measurement feedback is controlled to PLC control unit, PLC
Prefabricated rods charging rate and drawing speed are adjusted by unit processed according to fibre diameter data, play the whole of fiber drawing process
Body control action；
Coating: optical fiber enters coating operation, and coating die is the column structure of a hollow, fills acrylic resin in hollow cavity
Coating, in the motor process of optical fiber, the coating in hollow cavity covers uniformly on fiber outer surface, forms certain thickness
Coat, coat includes low modulus undercoating and high-modulus external coating, and undercoating is 0.8 with the dimension scale of external coating
~1.2:1；
Solidification: optical fiber enters cure lamp range of exposures, according to the situation of coat lower thickness, cure lamp solidification power is adjusted to
1800~3000W；
Screening: due to the reduction of fiber size, adjust the guide wheel speed of screening rewinding machine, provide 0.35 ~ 0.85g for traction optical fiber
Take-up pulling force.
The wire drawing coating processes of a kind of minor diameter low-loss bend-insensitive single-mode optical fiber the most according to claim 1, its
It is characterised by: in described step (1), heating in-furnace temperature controls at 1800 DEG C ~ 2200 DEG C.
The wire drawing coating processes of a kind of minor diameter low-loss bend-insensitive single-mode optical fiber the most according to claim 1, its
It is characterised by: in described step (2), furnace temp is at 900 DEG C ~ 1200 DEG C.
The wire drawing coating processes of a kind of minor diameter low-loss bend-insensitive single-mode optical fiber the most according to claim 1: its
Being characterised by: in described step (2), heating furnace is positioned at below annealing high temperature furnace at 15cm, and insulating tube is positioned at below heating furnace 20 ~
At 25cm.
The wire drawing coating processes of a kind of minor diameter low-loss bend-insensitive single-mode optical fiber the most according to claim 1, its
It is characterised by: in described step (4), includes the coniform inner chamber of up big and down small setting inside coating die and be connected to circular cone
The coating hole of shape inner chamber lower end, the tapering of coniform inner chamber is 3 ~ 25 °, and coating hole length is 0.8 ~ 5mm.
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| CN106908087A (en) * | 2017-04-10 | 2017-06-30 | 南京航空航天大学 | A kind of method for reducing temperature change to fiber sensor measuring effect of signals |
| CN107678086A (en) * | 2017-08-31 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of optical fiber for realizing that Gauss beam reshaping is one-dimensional flat top beam |
| CN108873158A (en) * | 2018-06-27 | 2018-11-23 | 深圳金信诺高新技术股份有限公司 | A kind of small diameter fiber and preparation method thereof |
| CN108919415A (en) * | 2018-07-19 | 2018-11-30 | 江苏南方光纤科技有限公司 | A kind of low-loss single-mode optical fiber and its drawing process |
| CN109116466A (en) * | 2018-08-24 | 2019-01-01 | 长飞光纤光缆股份有限公司 | A kind of thin footpath small-bend radius single mode optical fiber |
| CN110506032A (en) * | 2017-04-10 | 2019-11-26 | 株式会社藤仓 | The manufacturing method of optical fiber |
| CN111362572A (en) * | 2018-12-26 | 2020-07-03 | 深圳特发信息光纤有限公司 | Optical fiber preparation method and optical fiber |
| CN112897874A (en) * | 2021-05-07 | 2021-06-04 | 中天科技光纤有限公司 | Control method and control device for optical fiber drawing speed and optical fiber drawing system |
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| CN114371530A (en) * | 2020-12-24 | 2022-04-19 | 中天电力光缆有限公司 | Optical fiber structure, production method of optical fiber structure and optical cable structure |
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| CN110506032A (en) * | 2017-04-10 | 2019-11-26 | 株式会社藤仓 | The manufacturing method of optical fiber |
| CN106908087A (en) * | 2017-04-10 | 2017-06-30 | 南京航空航天大学 | A kind of method for reducing temperature change to fiber sensor measuring effect of signals |
| CN107678086A (en) * | 2017-08-31 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of optical fiber for realizing that Gauss beam reshaping is one-dimensional flat top beam |
| CN108873158A (en) * | 2018-06-27 | 2018-11-23 | 深圳金信诺高新技术股份有限公司 | A kind of small diameter fiber and preparation method thereof |
| CN108873158B (en) * | 2018-06-27 | 2024-06-07 | 深圳金信诺高新技术股份有限公司 | Small-diameter optical fiber and preparation method thereof |
| CN108919415A (en) * | 2018-07-19 | 2018-11-30 | 江苏南方光纤科技有限公司 | A kind of low-loss single-mode optical fiber and its drawing process |
| CN109116466A (en) * | 2018-08-24 | 2019-01-01 | 长飞光纤光缆股份有限公司 | A kind of thin footpath small-bend radius single mode optical fiber |
| CN111362572A (en) * | 2018-12-26 | 2020-07-03 | 深圳特发信息光纤有限公司 | Optical fiber preparation method and optical fiber |
| WO2022121259A1 (en) * | 2020-12-07 | 2022-06-16 | 中天科技光纤有限公司 | Optical fiber and preparation method therefor |
| CN114371530A (en) * | 2020-12-24 | 2022-04-19 | 中天电力光缆有限公司 | Optical fiber structure, production method of optical fiber structure and optical cable structure |
| CN112897874B (en) * | 2021-05-07 | 2021-11-16 | 中天科技光纤有限公司 | Control method and control device for optical fiber drawing speed and optical fiber drawing system |
| CN112897874A (en) * | 2021-05-07 | 2021-06-04 | 中天科技光纤有限公司 | Control method and control device for optical fiber drawing speed and optical fiber drawing system |
| CN113716862A (en) * | 2021-09-01 | 2021-11-30 | 中天科技光纤有限公司 | Method and apparatus for manufacturing optical fiber |
| CN113582534A (en) * | 2021-09-01 | 2021-11-02 | 中天科技光纤有限公司 | Method and apparatus for manufacturing optical fiber |
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